JPH0547832Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a pipe burying device, and particularly to an excavation device for excavating the ground without collapsing prior to burying a pipe.

(Prior technology) Conventionally, as a device for burying relatively small-diameter pipes of around 100φ underground, a digging head with a diameter smaller than that of the pipe is provided at the tip of the pipe to be buried so as to be able to move forward and backward. A pipe burying device is used in which earth and sand at the tip of a pipe is pushed forward or toward the outer circumference by moving the head back and forth, and the pipe is pushed into the gap created by this from behind and buried.

(Problem to be solved by the invention) However, in the above-mentioned conventional pipe burying device, the peripheral wall of the void formed in the ground by the forward and backward movement of the excavation head is fragile, so it is prone to collapse and it is difficult to bury the pipe efficiently. It was hot.

In view of this, the present invention provides an excavating device for a pipe burying device that can strengthen the peripheral wall of the hole when excavating a hole in the ground prior to burying the pipe, and can excavate a hole that will not be buried due to collapse. It was made for the purpose of providing.

[Structure of the idea]

(Means for Solving the Problems) In order to solve the problems of the prior art described above, the present invention provides a leading pipe at the tip of a pipe to be buried underground, and an excavator connected to the leading end of the leading pipe so as to be rotatably driven. In the pipe burying device for burying the pipe by excavating underground with a head, the excavation head is characterized in that the excavation head is provided with an eccentric outer circumferential surface that is eccentric with respect to the center of rotation.

(Function) With the above configuration, when the excavation head is pushed forward while being rotated, the excavation head mainly pushes away the earth and sand in the direction of the outer circumference, and the displaced earth and sand is smeared on the hole wall by the eccentric outer circumferential surface of the excavation head. As a result, the earth and sand on the wall of the hole is compacted and collapse is prevented, allowing the subsequent buried pipe to enter smoothly.

(Embodiments) The present invention will be described below with reference to embodiments shown in the drawings.

As shown in FIG. 5, the pipe burying device to which the present invention is applied has a drive unit 3 movably mounted on a base 2 installed at the bottom of a shaft 1 excavated from the ground surface. The drive unit 3 is moved forward and backward by the operation of a propulsion cylinder 5 interposed between the drive unit 3 and the reaction force receiver 4 .

The rear end of the tube 7 to be buried underground is received by the tube receiving section 6 on the front surface of the driving section 3, and the tube 7 can be pushed underground by the expansion of the propulsion cylinder 5.

In the present invention, a leading pipe 8 made of a steel pipe or the like is connected to the leading end of the pipe 7, and an excavating head 9 is rotatably connected to the leading end of the leading pipe 8.

As shown in FIGS. 1 to 4, this excavating head 9 has an eccentric outer circumferential surface 10 that is eccentric by an eccentric amount δ with respect to the rotation center 0 of the excavating head 9, and the tip of this eccentric outer circumferential surface 10 has a conical shape. It has a shaped tip 11. A portion of this eccentric outer circumferential surface 10 is formed to match a portion of the outer circumferential surface of the base portion 12 of the excavating head 9.

In the illustrated embodiment, the excavation head 9 is moved forward and backward relative to the guide pipe 8 at the same time as the excavation head 9 rotates. 8, and is rotatable and movable in the axial direction.

In the illustrated example, a hydraulic cylinder 13 and a known ball screw 14 are used in combination as a means for simultaneously rotating the excavating head 9 and moving it forward and backward. That is, a hydraulic cylinder 13 is installed axially inside the tip of the leading pipe 8, and this cylinder 1
An excavation head 9 is connected to the rod 15 of No. 3 via a ball screw 14, and rotation is applied to the excavation head 9 as the rod 15 moves back and forth. FIG. 1 shows the vehicle when it is moving backward, and FIG. 2 shows it when it is moving forward.

A flat inclined surface 17 is cut from the eccentric outer peripheral surface 10 of the excavating head 9 to the conical surface 16, and this inclined surface 17 is formed on the eccentric outer peripheral surface 10 of the excavating head 9 on the side closest to the rotation center 0. It is formed.

If the excavating head 9 is not moved forward or backward but only rotated, an electric motor, a hydraulic motor, or the like may be used in place of the hydraulic cylinder 13 to apply the rotation to the excavating head 9.

Next, the operation of the above embodiment will be explained.

When the rod 15 is reciprocated by remotely controlling a hydraulic cylinder 13 built in the leading pipe 8, the excavation head 9 moves backward while rotating to excavate underground.

The soil excavated by the conical tip 11 of the excavation head 9 is mainly pushed toward the outer circumference of the excavation head 9.

The earth and sand that has moved toward the outer circumference of the excavation head 9 is rubbed against the inner wall surface of the hole around it by the eccentric rotation of the eccentric outer circumferential surface 10 of the excavation head 9, and the hole wall is reinforced as if being smeared with a trowel. Ru. At this time, by giving the excavating head 9 several reciprocating motions, the smearing action can be performed more effectively.

Thereafter, when the excavation head 9 is brought into its most retracted state and the propulsion cylinder 5 is gradually extended, the leading pipe 8 is press-fitted into the hole excavated by the excavation head 9. During this time, the hole wall is sufficiently reinforced by the above-described action, so that the pipe 7 can be efficiently press-fitted without the hole wall collapsing.

Thereafter, the tubes 7 are buried by successively pushing them in while repeating the above operations.

Note that whether or not the course of the pipe 7 has deviated from the planned route is checked at any time by looking at the target 18 in the leading pipe 8 from inside the shaft 1 using a transit when the excavation head 9 is retracted the most.

If a displacement of the course of the pipe 7 is observed, extend the hydraulic cylinder 13 and direct the inclined surface 17 of the excavation head 9 in the direction opposite to the direction in which the course is desired to be corrected (direction of displacement of the pipe 7). When the propulsion cylinder 5 is extended and the pipe 7 is press-fitted, the pipe 7 is bent by the earth pressure on the slope 17 of the excavation head 9, and can be returned to the normal route.

Further, if water is injected from the tip of the excavation head 9 when consolidating the hole wall, the effect of strengthening the hole wall may be further enhanced.

[Effect of idea]

As explained above, according to the excavation device of the present invention, in the pipe burying device for burying a pipe underground, a leading pipe is provided at the tip of the pipe, and an excavation head is rotatably connected to the tip of the leading pipe. Since this excavation head has an eccentric outer peripheral surface that is eccentric to the center of rotation, when excavating the ground, the rotation of the eccentric outer peripheral surface presses and coats the excavated soil against the hole wall, which causes the hole wall to become coated. is strengthened and will not collapse when the tube is inserted. Therefore, since the hole wall is strengthened, no obstacles occur when inserting the tube, so the tube can be pushed forward smoothly and the tube can be buried efficiently.

Furthermore, if an inclined surface is provided at the tip of the eccentric outer circumferential surface of the excavation head, the excavation action during excavation can be performed well, and there is also an effect that it is possible to easily correct the course of the pipe when it is deviated.

[Brief explanation of the drawing]

Figures 1 and 2 are partially sectional side views showing an embodiment of the present invention, with Figure 1 showing the excavation head when it is retracting, Figure 2 when it is moving forward, and Figure 3 showing the excavation head when it is moving forward. FIG. 4 is a perspective view of the same excavation head, FIG. 4 is a front view thereof, and FIG. 5 is a schematic side view showing an example of a pipe burying device to which the present invention is applied. 3... Drive section, 5... Propulsion cylinder, 6... Pipe holder, 7... Pipe, 8... Leading pipe, 9... Excavation head, 10... Eccentric outer circumferential surface, 13... Hydraulic cylinder, 17 ...Slope surface.

Claims (1)

[Scope of claim for utility model registration] 1. Providing a lead pipe at the tip of a pipe to be buried underground,
A pipe burying device for excavating underground and burying the pipe by using an excavating head rotatably connected to the tip of the leading pipe, characterized in that the excavating head is provided with an eccentric outer circumferential surface that is eccentric with respect to the center of rotation. Excavation equipment for pipe burying equipment. 2. The excavating device in a pipe burying device according to claim 1, wherein the excavating head has an inclined surface at the tip of the eccentric outer circumferential surface.